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%I #9 Jul 13 2013 12:03:51
%S 1,6,23,56,168,459,1080,2400,5461,12678,28728,63336,138717,303346,
%T 663179,1438098,3062730,6450121,13583957,28627773,59954459,124413466,
%U 258510987,543867101,1152248068,2428235533,5069886692,10511339217,21696371682,44710463120
%N Central terms of Zorach additive triangle (cf. A035312).
%C a(n) = A035312(2*n,n).
%H Reinhard Zumkeller, <a href="/A189713/b189713.txt">Table of n, a(n) for n = 0..500</a>
%H A. C. Zorach, <a href="http://www.cazort.net/static/triangle.php">Additive triangle</a>
%H <a href="/A035312/a035312_2.hs.txt">Haskell programs for sequences in connection with Zorach additive triangle</a>
%o See link for Haskell program.
%Y Cf. A035311, A035313.
%K nonn
%O 0,2
%A _Reinhard Zumkeller_, Apr 30 2011
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